Process and Pattern

Etiology	Incubation/ Latency	Time Clustering	Space Clustering	Space/Time Clustering	Space/Time Interaction
Single Point Source Exposure	Short	?+	+	?	?
	Long	-	?	-	?
Non-point Source exposure	Short	+	-	-	?
	Long	-	-	-	-
Infectious/Contagious	Short	+	+	+	?
	Long/Varied	?	?	?	?
Genetic	Long	-	?	-	?
Poverty	Long	?	?	?	?

Table 1:

"+" indicates that there should be the indicated clustering;
"-" means we wouldn't expect any;
"?" indicates we're not sure, or feel that it could vary.
Age, education, sex: effect modifiers?

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aelon@sph.umich.edu